<?php
/********************************************/
/*		db2数据库连接 db_mysql.php			*/
/*		2007-12-20 leo	整理		*/
/********************************************/

if(!defined("SQL_UMS_PHP"))
{

	define("SQL_UMS_PHP","mysql");

	class sql_db
	{

		var $db_connect_id;
		var $query_result;
		var $row = array();
		var $rowset = array();
		var $num_queries = 0;
		public $chartset ="";
		
		//
		// Constructor
		//
		function prepare($sql)
		{
			$stmt = $this->db_connect_id->prepare($sql);
			return $stmt; 
		}
	
		function sql_db($sqlserver, $sqluser, $sqlpassword, $database, $persistency = true)
		{

			$this->persistency = $persistency;
			$this->user = $sqluser;
			$this->password = $sqlpassword;
			$this->server = $sqlserver;
			$this->dbname = $database;

			if($this->persistency)
			{
				//$this->db_connect_id = new mysqli($sqlserver, $sqluser, $sqlpassword, $database);
	
				$this->db_connect_id = mysql_pconnect($this->server, $this->user, $this->password);
				//$this->db_connect_id = new mysqli_stmt();
				//$this->db_connect_id->b
				//$this->db_connect_id-> 
			}
			else
			{
				$this->db_connect_id = mysql_connect($this->server, $this->user, $this->password);
				
			}
			if($this->db_connect_id)
			{
				if($database != "")
				{
					$this->dbname = $database;
					$dbselect = @mysql_select_db($this->dbname);
					if(!$dbselect)
					{
						@mysql_close($this->db_connect_id);
						$this->db_connect_id = $dbselect;
					}
				}
				return $this->db_connect_id;
			}
			else
			{
				return false;
			}
		}

		//
		// Other base methods
		//
		function sql_close()
		{
			if($this->db_connect_id)
			{
				if($this->query_result)
				{
					@mysql_free_result($this->query_result);
				}
				$result = @mysql_close($this->db_connect_id);
				return $result;
			}
			else
			{
				return false;
			}
		}

		//
		// Base query method
		//
		function sql_query($query = "", $transaction = FALSE)
		{
			// Remove any pre-existing queries
			 
			
			if($query != "")
			{
				$this->num_queries++;
				mysql_query( "set  names  'utf8' ");	
				
					
				$this->query_result = @mysql_query($query, $this->db_connect_id);
			}
			if($this->query_result)
			{
				unset($this->row[$this->query_result]);
				unset($this->rowset[$this->query_result]);
				return $this->query_result;
			}
			else
			{
				$this->halt("无效的 SQL: ".$query);
				return ( $transaction == END_TRANSACTION ) ? true : false;
			}
		}

		//
		// Other query methods
		//
		function sql_numrows($query_id = 0)
		{
			if(!$query_id)
			{
				$query_id = $this->query_result;
			}
			if($query_id)
			{
				$result = @mysql_num_rows($query_id);
				return $result;
			}
			else
			{
				return false;
			}
		}
		function sql_affectedrows()
		{
			if($this->db_connect_id)
			{
				$result = @mysql_affected_rows($this->db_connect_id);
				return $result;
			}
			else
			{
				return false;
			}
		}
		function sql_numfields($query_id = 0)
		{
			if(!$query_id)
			{
				$query_id = $this->query_result;
			}
			if($query_id)
			{
				$result = @mysql_num_fields($query_id);
				return $result;
			}
			else
			{
				return false;
			}
		}
		function sql_fieldname($offset, $query_id = 0)
		{
			if(!$query_id)
			{
				$query_id = $this->query_result;
			}
			if($query_id)
			{
				$result = @mysql_field_name($query_id, $offset);
				return $result;
			}
			else
			{
				return false;
			}
		}
		function sql_fieldtype($offset, $query_id = 0)
		{
			if(!$query_id)
			{
				$query_id = $this->query_result;
			}
			if($query_id)
			{
				$result = @mysql_field_type($query_id, $offset);
				return $result;
			}
			else
			{
				return false;
			}
		}
		function sql_fetchrow($query_id = 0)
		{
			if(!$query_id)
			{
				$query_id = $this->query_result;
			}
			if($query_id)
			{
				$this->row[$query_id] = @mysql_fetch_array($query_id);
				return $this->row[$query_id];
			}
			else
			{
				return false;
			}
		}
		function sql_fetchrowset($query_id = 0)
		{
			if(!$query_id)
			{
				$query_id = $this->query_result;
			}
			if($query_id)
			{
				unset($this->rowset[$query_id]);
				unset($this->row[$query_id]);
				while($this->rowset[$query_id] = @mysql_fetch_array($query_id))
				{
					$result[] = $this->rowset[$query_id];
				}
				return $result;
			}
			else
			{
				return false;
			}
		}
		function sql_fetchfield($field, $rownum = -1, $query_id = 0)
		{
			if(!$query_id)
			{
				$query_id = $this->query_result;
			}
			if($query_id)
			{
				if($rownum > -1)
				{
					$result = @mysql_result($query_id, $rownum, $field);
				}
				else
				{
					if(empty($this->row[$query_id]) && empty($this->rowset[$query_id]))
					{
						if($this->sql_fetchrow())
						{
							$result = $this->row[$query_id][$field];
						}
					}
					else
					{
						if($this->rowset[$query_id])
						{
							$result = $this->rowset[$query_id][$field];
						}
						else if($this->row[$query_id])
						{
							$result = $this->row[$query_id][$field];
						}
					}
				}
				return $result;
			}
			else
			{
				return false;
			}
		}
		function sql_rowseek($rownum, $query_id = 0){
			if(!$query_id)
			{
				$query_id = $this->query_result;
			}
			if($query_id)
			{
				$result = @mysql_data_seek($query_id, $rownum);
				return $result;
			}
			else
			{
				return false;
			}
		}
		function sql_nextid(){
			if($this->db_connect_id)
			{
				$result = @mysql_insert_id($this->db_connect_id);
				return $result;
			}
			else
			{
				return false;
			}
		}
		function sql_freeresult($query_id = 0){
			if(!$query_id)
			{
				$query_id = $this->query_result;
			}

			if ( $query_id )
			{
				unset($this->row[$query_id]);
				unset($this->rowset[$query_id]);

				@mysql_free_result($query_id);

				return true;
			}
			else
			{
				return false;
			}
		}
		
		function sql_error($query_id = 0)
		{
			$result["message"] = @mysql_error($this->db_connect_id);
			$result["code"] = @mysql_errno($this->db_connect_id);

			return $result;
		}

		function halt($msg = "") 
		{
			$error_msg = $this->sql_error();
			echo "Database error in ".$error_msg["code"]."\n";
			echo "<!-- ".$error_msg["code"]." -->\n";
			echo "<!-- ".$error_msg["message"]." -->\n";
			echo "<!-- Database error in $this->appname: $msg -->\n";
			return;
		}

	} // class sql_db

} // if ... define
?>